I don't know. I didn't grow anything weird, but I also don't have any lost digits. I don't have anything to grow back, unless eyesight counts.

[That.. is a possibility if they find out what caused it, and the source doesn't end up being a horrifically awful for Levi. What if the growing never stops and he ends up with four foot long black fingers? What if Hange stuck an eye in it? Would it grow out like black rock too?]

But we also got those magical trees, which are strange too. You've seen how fast they grow, and what they grow. I feel like we should start there if you're sure you didn't do anything weird here in the city.

I can ask the Research Center, or the Guild Leader?